Dim efi

It will be 2 events per injector/rev, and the fuel is delivered in the correct place. The timer interrupts will still be executing for other activities for either, so insignificant time change either way. There is more timer granularity in short delivery times plus more error related to injector open/close delays at short on intervals for the batch delivery. The separate injection will have nearly twice the pulse width, however it will happen at low RPM, so it should work fine. I verify everything, so as I get into it in the running system I will know what works.

I like your idea of the Ford CFI TBI. I think is is used between 1982-87' on some vehicles. The direct bolt-on, or less adapter work would be great. Now to find one from a 5.0L H.O.